Microbio 8

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What pigments are required for photosynthesis?

Light sensitive pigments
What type of phototrophs have chlorphyll a?

Osygenic phototrops
What kind of phototrophs have Bacteriochlorophyll a?

Anoxygenic phototrophs
How is chlorophyll or bacteriochlorophyll often arranged?

Pftem arramged in photocomplexes containing other photosensitive pigments and proteins
Which pigments participate directly in photosnthesis?

Only the pigments in the reaction center
What is the purpose of the pigments that surround the reaction center?

They act as antenna to harvest light and funnel its energy into the reaction center
What are caroenoids?

Hydrophibic, light-sensitive pigments firmly embedded in the photosynthetic membrane
What is the primary role of carotenoids?

To protect the system against bright light, which may lead to production of toxic forms of oxygen
What do phycobilins do>

Form complexes with proteins that are in the main light-harvesting systems in cyanobacteria: phycobilisomes
Where does photosynthesis take place in eukaryotes?

Chloroplasts
Where does photosynthesis occur in prokaryotes?

The photosynthetic pigments are interated into the internal membrane
What is the best photosystem to capture energy at very low light intensity?

Chlorosomes
Which prokaryotes are chlorosomes found?

Green sulphur and green non sulpur bacteria
Which prokaryotes use oxygenic photosynthesis

Algae, cyanobacteria
How is oxygen used in photosynthesis?

Use light energy to oxidize H2O and the e- go to the electron transport chain that leads to the generation of a pmf that drives ATP synthase
How does anoxygenic photosynthesis take place?
- H2S inhibits PsII
- Oxidized H2S as electron source
- e- goes through the electron transport chain that leads to the creation of a pmf that drives ATP synthase
What are chemoautotrophs?

Use inorganic compounds as a source of energy and electrons and CO2 as carbon source
What do nitrigying bacteria use as an electron donor?

Ammonia and nitrite
What do nitrosomonas do?
- Oxidize ammonia to nitrite and another group to oxidize nitrite to nitrate
- Nitrite is toxic, nitrate is a better source of nitrogen for plants
What conditions does nitrification need to occur?

Aerobic condition
How is energy produced in nitrobacter spp??
- Nadh is produced by reverse electrons flor
- pmf is the energy source
- Very low yield
How is energy produced in sulfur bacterias?
- oxidize sulphur compounds, with O2 as an electron acceptor
- Produce SO₄^2- and a proton (acid run-off from coal mines)
- sulfide H2S) is stored in cell
How is acid run-off from coal mines produced?

Sulfur bacteria produce SO₄^2- aqnd a proton, which is acidic
Are methanogens aerobe or anaerobe?

Strict anaerobe
Where are methanogens found>

Marches
Wht do methanogens produce?

CH4
Are methanotrophs aerobe or anaerobe?

Strict aerobe
What do methanotrophs use as a source of energy?

CH4

Author

Morgan.liberatore

138047

Card Set

Microbio 8

Description

icrobio 8

Updated

2012-02-27T13:14:55Z